WPS Office+PDF has own over 600 Millions users worldwide till now.
WPS Office V9.9 the latest version fully supports the latest Android 7.0 Nougat OS. Multi-window mode lets you easy to deal with different tasks at the same time.

CNET: ”An all-in-one office app with speedy performance” “one of the best mobile office suites”
USA Today: “Best Apps for Mobile Phones and Tablets”
Gizmodo: "Essential app for your new Android phone or tablet” ”There may well be better Office apps out there, but this is one of the best free ones.”
Economic Times: “one of the best free document viewer and editing apps available”